Spring Lake Max Depth
Greene County, IowaView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Turbidity
- #1 of 1 in the county
- 28 ft max depth
Spring Lake Max Depth in Greene County, Iowa has a water quality grade of F (Algae-prone). Water clarity: 0.9 ft visibility. Phosphorus: 77 µg/L. Chlorophyll-a (algae): 41.2 µg/L.
- Clarity
- 0.9 ft
- Typical in August
- 80°F
- Max depth
- ~28 ft est.
- Type
- Hypereutrophic
- Trend
- ↓ Declining
Stays via Stay22
Stays near Spring Lake Max Depth
Compare lakeside cabins, hotels, and vacation rentals near Spring Lake Max Depth in Greene County, Iowa — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Spring Lake Max Depth are listed below.
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Free interactive depth-contour map of Spring Lake Max Depth, reaching a maximum surveyed depth of 6 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Iowa DNR.
Spring Lake Max Depth is a highly nutrient-loaded hypereutrophic lake in Greene County, Iowa with an estimated average depth of about 28 feet. Water quality is graded F based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-04. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The F is nutrients and algae, not a swimming clearance. Spring Lake Max Depth is listed impaired under Clean Water Act §303(d) (IR 4A) for turbidity. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
Very murky, less than 0.9 ft of visibility. Phosphorus 77 µg/L. Chlorophyll-a 41.2 µg/L. TSI 71. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.9 ft | Not graded |
| Phosphorus | 77 µg/L | Not graded |
| Chlorophyll-a (Algae) | 41.2 µg/L | Poor |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Spring Lake Max Depth typically sits around 80°F at the surface in August. Summer average is about 79°F. Usually warmest in Jul (about 81°F) and coldest in May (about 64°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 26 field readings (2010–2023) via the EPA Water Quality Portal. See the full Spring Lake Max Depth water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~28 ft est. |
| Average Depth | ~9 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Iowa has not published bathymetry for Spring Lake Max Depth.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Spring Lake Max Depth
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.03 m/yr | 4 |
| Phosphorus | ↑ Improving | -2.95 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +4 µg/L/yr | 4 |
EPA Impairment Status
Spring Lake Max Depth is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 04-RAC-1152 · Official waterbody report · Matched by proximity (0.3 km)
County Ranking
Ranked #1 of 1 lakes in Greene County
Nearby Lakes With Higher Grades
Spring Lake Max Depth holds Grade F. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Greene County
Frequently asked questions about Spring Lake Max Depth
Where is Spring Lake Max Depth?
- Spring Lake Max Depth is a lake in Greene County, Iowa. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Spring Lake Max Depth?
- Spring Lake Max Depth in Greene County, Iowa has a water quality grade of F (Algae-prone). Water clarity: 0.9 ft visibility. Phosphorus: 77 µg/L. Chlorophyll-a (algae): 41.2 µg/L.
Is Spring Lake Max Depth safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Spring Lake Max Depth is listed impaired under Clean Water Act §303(d) (IR 4A) for turbidity. Check local advisories before you swim.
What is the water temperature of Spring Lake Max Depth?
- Spring Lake Max Depth typically sits around 80°F at the surface in August, from 26 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
How deep is Spring Lake Max Depth?
- No published bathymetric survey covers Spring Lake Max Depth, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 28 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Spring Lake Max Depth across LakeQuality
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Where this data comes from
47 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Iowa DNR Surface Water Monitoring Data
21IOWA_WQX47 samples · 2021–2024
Analytical methods
- Unknown
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- In-Vitro Determination of Chlorophyll
- ISU modification of APHA 2130-B
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)